JP3821882B2 - Winding electrode manufacturing equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a manufacturing apparatus capable of manufacturing a cylindrical electrode having a high capacity with a high yield.
[0002]
[Prior art]
In recent years, as electronic devices such as mobile phones and portable notebook computers are made coatless, have higher performance, and are smaller and lighter, it is required to increase the capacity of secondary batteries serving as power sources for these electronic devices. ing. That is, as a secondary battery serving as a power source, a nickel metal hydride secondary battery has been put into practical use in place of the conventionally used lead storage battery and nickel cadmium battery.
[0003]
By the way, this type of secondary battery generally includes a wound electrode (electromotive portion) formed by winding a laminate of a positive electrode sheet, an interlayer insulating sheet, a negative electrode sheet, and an interlayer insulating sheet. The structure is liquid-tightly sealed in a shaped outer container. And the wound electrode of this cylindrical battery usually sandwiches one or two strip-shaped separators (interlayer insulation sheet) by a pair of core rods (core bodies) having a semi-cylindrical portion. After separating the strip-shaped positive electrode sheet and the strip-shaped negative electrode sheet on the separator, the core rod is rotated to wind it in a spiral shape, and then the core rod is slightly reversed and wound. It is manufactured by creating a space between the rod and pulling out the core rod.
[0004]
FIG. 2 is a plan view showing a main configuration of a manufacturing apparatus conventionally used for manufacturing a wound electrode. Here, 1 is a winding mechanism main body having a winding core body 1a for winding a belt-like positive electrode sheet 2, a belt-like negative electrode sheet 3 and belt-like interlayer insulating sheets 4, 4 'in a spiral shape, A guide mechanism for running and supplying the positive electrode sheet 2, the interlayer insulating sheet 4, the negative electrode sheet 3 and the interlayer insulating sheet 4 ′ separately to the core body 1 a of the mechanism body 1, Installed in a movable / retractable type with respect to the core body 1a of the mechanism body 1, and presses the outer peripheral surface of the wound electrode formed in a spiral shape on the core body 1a with a certain pressure. This is a pressure roller that achieves dense winding.
[0005]
In this configuration, the winding core body 1a of the winding mechanism main body 1 includes a semi-cylindrical section that forms an opposed flat surface portion so that the interlayer insulating sheet can be sandwiched. The guide mechanism 5, the guide block 5 _1, 5 _2, 5 _3, 5 ₄ turned into, the guide block 5 _1, 5 _2, 5 _3, 5 ₄ combinations, the required travel path 5a, 5b, 5c and 5d are formed, and the guide blocks 5 ₁ , 5 ₂ , 5 ₃ , and 5 ₄ are slidable by the vacuum air so that the interlayer insulating sheets 4 and 4 ′ are slid on the travel surface. It is supposed to be retained.
[0006]
And the manufacture of the winding type electrode by this manufacturing apparatus is performed as follows. That is, an interlayer insulating sheet (separator) is sandwiched between opposing flat surfaces of the winding core 1a, the negative electrode sheet 3 is sandwiched between the interlayer insulating sheets 4, and the positive electrode sheet 2 is disposed between the interlayer insulating sheets 4 '. While being supplied in the form of each, it winds by rotating and driving the core 1a of the winding mechanism body 1. In other words, while the sheets 2, 3, 4 and 4 'are stacked and wound around the core 1a in a spiral shape, the outer peripheral surface of the spiral is formed by the pressure rollers 6a and 6b at a constant pressure. To form a wound electrode (electromotive unit). Thereafter, the winding core body 1a is slightly rotated in the reverse direction to loosen the winding of the wound electrode with respect to the winding core body 1a to separate them.
[0007]
[Problems to be solved by the invention]
However, the conventional wound electrode manufacturing method has the following disadvantages. For example, as the nickel-metal hydride secondary battery is reduced in size and capacity, the thickness of the positive electrode sheet 2 and the negative electrode sheet 3 tends to increase. On the other hand, for storage and mounting in a battery outer can of a predetermined size Therefore, dense lamination and winding are required. This dense lamination and winding makes it possible to form a wound electrode suitable for miniaturization and high capacity, but makes it difficult to separate the wound and formed wound electrode from the winding core 1a. Yes.
[0008]
That is, after the dense lamination and winding, even if the core body 1a is rotated in the reverse direction, the laminated / wound portion adjacent to the core body 1a is difficult to loosen. May reversely rotate and dense stacking and winding may be broken. Further, if the winding core 1a is pulled out while the looseness of winding with respect to the winding core 1a is incomplete, the interlayer insulating sheets 4 and 4 'of the laminated / winding portion adjacent to the winding core 1a The electrode sheets 2 and 3 may be damaged. Alternatively, the laminated / wound portion adjacent to the core body 1a may be pulled out together with the core body 1a, and a required wound electrode may not be obtained. That is, it is difficult to obtain a high-capacity wound electrode with high yield and high reliability, and as a result, it is difficult to increase the capacity of the secondary battery.
[0009]
Accordingly, an object of the present invention is to provide a manufacturing apparatus that can be densely wound and can produce a wound electrode (electromotive part) for increasing the capacity with high yield.
[0010]
[Means for Solving the Problems]
The invention according to claim 1, the winding mechanism body having a strip-shaped positive electrode sheet, the interlayer insulating sheet, forward and reverse rotatable winding core of winding the laminated and spirally a negative electrode sheet and the interlayer insulating sheet, wherein A gripping surface having an arc-shaped cross section for gripping a cylindrical electrode formed by winding each of the sheets on the core body, and the gripping surface is disposed concentrically facing the core body . a pair of cylindrical electrodes holding block is arranged to be able to advance and retreat between the cylindrical electrode holding block, and in response to the cylindrical electrode while opposing pressing MakiSomen of the cylindrical electrode in diametrically An apparatus for manufacturing a wound electrode comprising a pressure roller that rotates only in a certain direction.
[0011]
According to a second aspect of the invention, apparatus for manufacturing a wound electrode according to claim 1, that cylindrical electrodes holding block is movably set in the vertical and horizontal directions while holding the cylindrical electrodes Features.
[0012]
According to a third aspect of the present invention, in the wound electrode manufacturing apparatus according to the first or second aspect, the rotation direction of the pressure roller is controlled by a one-way clutch mechanism, and the pressure roller surface is laminated and spirally formed. It is characterized in that it rotates in contact with the outer peripheral surface of the wound body by means of the winding core rotational force.
[0013]
That is, in the present invention, a wound electrode forming sheet is spirally and cylindrically wound around a winding core body, and the outer peripheral surface of the cylindrical wound body is pressed with a pressure roller, and the dense winding is performed. On the other hand, after the spiral and cylindrical winding is completed, only the core body is selectively reversely rotated to loosen the dense winding only of the winding adjacent to or adjacent to the core body, Technology of removal from the core, and skeleton that as easily separated.
[0014]
As described above, in the present invention, after winding the winding core in a cylindrical shape to form a required wound electrode, the winding core is reversely rotated while suppressing the reverse rotation of the wound electrode. Thus, a slight space is formed between the wound electrode and the winding core. Therefore, the core body can be easily pulled out and separated from the wound electrode. That is, damage to the wound electrode itself or collapse of dense winding can be avoided, and a high quality wound electrode having a required high capacity and high yield can be manufactured.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment will be described with reference to FIG.
[0016]
FIG. 1 is a plan view showing the main configuration of a wound electrode manufacturing apparatus according to this embodiment. In FIG. 1, 7 rotates in the direction of arrow A to wind the strip-shaped negative electrode sheet 8, positive electrode sheet 9 and interlayer insulating sheets (separate) 10, 10 ′ in a spiral shape, while rotating in the reverse direction in the direction of arrow B This is a winding mechanism body having a winding core (winding rod) 7a with a drive mechanism (not shown) that can be used. Here, the core body 7a is configured to include a semicircular section in cross section that forms opposed flat surface portions so that the interlayer insulating sheet can be sandwiched. A guide mechanism 11 supplies the negative electrode sheet 8, the interlayer insulating sheet 10, the positive electrode sheet 9, and the interlayer insulating sheet 10 'to the core 7a of the winding mechanism body 7.
[0017]
Further, 12a and 12b are arranged concentrically and opposed to the core 7a, and a pair of opposing surfaces that hold the outer peripheral surface of the cylindrical electrode to be wound have arcs of half cylinder or less. a cylindrical electrodes holding block. Here, the cylindrical electrode holding blocks 12a and 12b hold the cylindrical electrode wound around the core 7a so as to spiral the electrode forming sheets 8, 9, 10, and 10 '. In the process of being wound in the shape, it is separated from the core 7a and stands by, and functions so as to approach the outer peripheral surface of the cylindrical electrode and hold it sandwiched after the end of winding.
[0018]
The cylindrical electrode holding blocks 12a and 12b can be moved up and down or horizontally by a drive mechanism while holding the cylindrical electrode in order to enhance the holding function of the cylindrical electrode. Driveable). That is, after holding the cylindrical electrode in a state of being pulled out from the core body 7a, moving upward and withdrawing / separating from the core body 7a, when moving to a predetermined position by movement in the horizontal direction, If it is configured to release the clamped holding of the cylindrical electrode and return to the original state / position, the operation can be automatically advanced.
[0019]
13a and 13b are disposed so as to be movable back and forth between the cylindrical electrode holding blocks 12a and 12b, and in a diametrical direction corresponding to the cylindrical electrode wound and formed on the core 7a, for example, an air cylinder 14a , 14b, a pair of pressure rollers 15a, 15b are one-way clutch mechanisms built in the pressure rollers 13a, 13b. Here, the pressure rollers 13a and 13b rotate only in one direction (arrow C direction, D direction) corresponding to the rotation of the core body 7a, and are being wound and formed on the core body 7a. The outer peripheral surface of the electrode is pressed with a constant pressure to achieve precise winding and formation. Accordingly, the pressure rollers 13a and 13b are installed so as to be capable of moving back and forth (moving) in the diameter direction of the core body 7a corresponding to the winding and formation of the cylindrical electrode. The pressure applied by the pressure rollers 13a and 13b is appropriately selected and adjusted according to the material and thickness of the electrode forming sheets 8, 9, 10, and 10 ', the capacity and dimensions of the cylindrical electrode, and the like.
[0020]
Next, a description will be given of an example of manufacturing a wound electrode by a manufacturing apparatus whose main configuration is shown in FIG.
[0021]
First, in order to act as the interlayer insulating sheets 10 and 10 'between the spaced apart and opposed flat portions of the winding core 7a, tape-like insulating sheets wound on both ends on a rewinding roller (not shown) are inserted. Or pinch. Here, the insulating sheet is, for example, a tape having a thickness of 0.2 mm and a width of 63 mm, and a tape-shaped positive electrode sheet 9 having a thickness of, for example, 0.6 mm and a width of 60 mm is disposed on one side, and the other side is, for example, thick. A tape-like negative electrode sheet 8 having a length of 0.3 mm and a width of 60 mm is disposed along the same.
[0022]
Next, the winding core 7a is driven and rotated in the direction of arrow A, and the guide mechanism 11 slidably moves the laminate of the positive electrode sheet 9 and the insulating sheet 10 and the laminate of the negative electrode sheet 8 and the insulating sheet 10 '. And spirally wound on the outer peripheral surface of the core body 7a. In this spiral winding, the pair of pressure rollers 13a and 13b rotate in the directions of the arrows C and D, respectively, and are kept in contact with the spiral / winding surface at a constant pressure while being in contact with the spiral / winding surface. Is advanced. That is, a precise vortex / winding without loosening is performed by advancing the vortex / winding with a certain pressure applied to the vortex / winding surface. At the end of the spiral winding of the laminate of the positive electrode sheet 9 and the insulating sheet 10 and the laminate of the negative electrode sheet 8 and the insulating sheet 10 ', in other words, manufacture of a wound electrode corresponding to the battery capacity In the final stage of formation, after the winding of the positive electrode sheet 9 is finished, the laminated body of the negative electrode sheet 8 and the insulating sheet 10 ′ is passed (covered) beyond the winding terminal portion of the positive electrode sheet 9. A cylindrical electrode having an outer peripheral surface constituted by the negative electrode sheet 8 is finally formed.
[0023]
At the end of the production of the wound electrode, the core 7a is driven and rotated in the direction of arrow B while the pressure rollers 13a and 13b are in contact with the outer peripheral surface of the spiral wound body. At this time, since the outer peripheral surface of the wound electrode formed by stacking and winding is pressed and fixed by the pressure rollers 13a and 13b, the winding body 7a is rewound by reverse rotation in the arrow B direction. Is also suppressed. In other words, only in the portion adjacent to or close to the core body 7a, the core body 7a is subjected to the reverse rotation action, and the portion of the densely laminated / winding is slightly loosened and can be pulled out from the core body 7a. A space part is generated.
[0024]
In this state, the cylindrical electrode holding blocks 12a and 12b are driven by a driving mechanism (not shown), the outer peripheral surface of the cylindrical electrode (winding electrode) is clamped and held, and the core is moved upward. Pull out and separate from body 7a. Furthermore, if necessary, after moving to a predetermined position by moving in the horizontal direction, etc., after releasing the clamped holding of the cylindrical electrode, it can be automatically advanced by returning it to its original state / position. It is.
[0025]
As described above, the outer peripheral surface on which the fine winding is performed is pressed / suppressed with a required pressure, while the winding core 7a and the wound electrode are separated by the reverse rotation of the winding core 7a. Since this is done, phenomena such as damage to the wound electrode and collapse of the dense winding due to separation of the two and withdrawal of the core 7a are eliminated. In addition, a high capacity, small size and high quality cylindrical electrode (winding electrode) can be easily provided with a high yield, and thus a highly reliable secondary battery with high capacity can be provided.
[0026]
In addition, this invention is not limited to the said Example, A various deformation | transformation can be taken in the range which does not deviate from the meaning of invention. For example, the thickness and width of the insulating sheet, the positive electrode sheet, and the negative electrode sheet can be appropriately set according to the type and capacity of the target secondary battery.
[0027]
【The invention's effect】
According to the invention of claim 1, after the winding of the tape-shaped positive electrode sheet, the tape-shaped negative electrode sheet and the interlayer insulating sheet (separator), the outer peripheral surface of the wound body is pressed with an appropriate pressure to generate looseness. The winding of the winding start part (core core adjacent part) of the wound body can be selectively loosened while avoiding or suppressing the above. In other words, it is possible to avoid or suppress the occurrence of looseness of the entire wound body, while forming a slack or space that allows the winding core body to be pulled out and separated only in a certain region. Accordingly, it is possible to obtain a cylindrical wound electrode that is densely wound, has a small outer diameter, and can easily achieve a high capacity with a high yield. As a result, it can greatly contribute to the provision of a highly reliable secondary battery. Contribute.
[0028]
According to the second and third aspects of the invention, it is possible to more efficiently provide a cylindrical wound electrode that is densely wound, has a small outer diameter, and can easily achieve high capacity.
[Brief description of the drawings]
FIG. 1 is a plan view showing a structural example of a main part of a wound electrode manufacturing apparatus according to the present invention.
FIG. 2 is a plan view showing a main structure of a conventional wound electrode manufacturing apparatus.
[Explanation of symbols]
1,7 …… Winding mechanism body
1a, 7a ...... Cores 2, 9 ... Strip-shaped positive electrode sheets 3, 8 ... Strip-shaped negative electrode sheets 4, 4 ', 10, 10' ... Interlayer insulating sheets 5, 11 ... Guide mechanism
6a, 6b, 13a, 13b …… Pressure roller
12a, 12b …… Cylindrical electrode holding block
14a, 14b …… Air cylinder
15a, 15b …… One-way clutch mechanism

Claims (3)

A winding mechanism main body having a winding core body that can be rotated in the forward and reverse directions, in which a belt-like positive electrode sheet, an interlayer insulating sheet, a negative electrode sheet, and an interlayer insulating sheet are laminated and wound in a spiral shape;
Wherein the core body on has a cross-section arcuate gripping surface for gripping the cylindrical electrode formed by turning each sheet winding, arranged said gripping surface and concentrically opposite to said core member a pair of cylindrical electrodes holding blocks,
Is movably arranged between the cylindrical electrode holding block, and in correspondence with said cylindrical electrode, and a pressure roller that rotates only in a predetermined direction while facing pressing MakiSomen of the cylindrical electrode in diametrically A wound-type electrode manufacturing apparatus comprising:   2. The wound electrode manufacturing apparatus according to claim 1, wherein the cylindrical electrode holding block is configured to hold the cylindrical electrode and be movable in a vertical direction and a horizontal direction.   The rotation direction of the pressure roller is controlled by a one-way clutch mechanism, and the pressure roller surface is in contact with the outer peripheral surface of the laminated / spiral wound body and is rotated by a winding core rotational force. The manufacturing apparatus of the wound electrode of Claim 1 or Claim 2.

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